Speed-regulator system



March 31. 1925.

C. A. BODDIE SPEED REGULATOR SYSTEM Filed March 11 1919 7 AAA/MAM vvvvvvvvv lNVENT C/areme flBood/.

WITNESSES:

ATTORNEY J3 Wei/w Patented Mar. 31, 1925.

UNITED STATES PATENT OFFICE.

CLARENCE A. BODDIE, OF PITTSBURGH,

PENNSYLVANIA, ASSIGNOR TO WESTING- VANIA.

SPEED-REGULATOR: SYSTEM.

Application filed March 11, 1919. Serial No. 281,913.

To all whom it may concern:

Be it known that I, CLARE CE A- BODDIE, a citizen of the United States, and a-resident of Pittsburgh, in the county ofAllegheny and State of Pennsylvania, have invented a new and useful Improvement in Speed-Regulator Systems, of which the following is a specification.

' y invention relates to speed-regulator systems for maintaining the speed of electric motors substantially constant.

One object of my invention is to provide a speed-regulator system of the above-indicated character that shall maintain the speed of a motor substantially constant in a simple and economical manner and be substantially free from any so-called hunting action.

Another'object of my invention is to provide a motor-speed-regulator system that shall have a plurality of means for insurin it against any hunting action..

11 many cases, it is desirable to operate a motor at a substantially constant speed, irrespectiveof the load which may be placed upon it or of the electrical conditions of the power circuit connected to the motor. Thus, for example, it may be essential, at times, that a blower motor, which is operated to maintain a circulation of air in a test tunnel, be operated constantly and at a substantially constant speed, irrespective of the surrounding conditions.

In a speed-regulator system constructed in accordance with my invention, the blower motor is supplied with power directly from a suitable generator, and a magnet or an auxiliary direct-current generator is connected to the motor in a manner to be operated in accordance with motor speed. A regulator of the vibratory-contact type having a main control magnet and an auxiliary magnet is provided for maintaining the speed of the motor substantially constant.

The main control magnet of the regulator is operated by the auxiliary generator in accordance with the. motor speed and serves to govern the operation of the main contact members of the regulator. The main contact members, in turn, control two relays, one of which governs the excitation of the main generator to control the speed of the motor and the other of which controls a prevent a hunting action of resistor in the energizing circuit of the main control magnet to prevent a hunting action by the regulator.

The auxiliary magnet is energized in accordance with the voltage of the main generator to oppose the operation of the main contact members by the main control magnet and thus prevent a hunting action by the regulator. The auxiliary magnet is also connected to the auxiliary generator and receives a basic excitation therefrom which increases the sensitiveness of the auxiliary magnet to small changes in voltage of the main generator and which exerts a force to the regulator by varying the excitation of the auxiliary magnet in accordance with the speed of the motor. Thus, any hunting action by the regulator is opposed by varying the resistance included in the energizing circuit of the main control magnet and by varying the excitation of the auxiliary magnet, not only in accordance with the main generator voltage but also in accordance with the speed of the motor.

The single figure of the accompanying drawing is a diagrammatic view of a s eedregulator system constructed in accor ance with my invention.

Referring to the drawing, a blower motor 1, having an armature 2 and a field winding 3, is connected to a main generator 4 comprising an armature 5 and a field winding 6. A resistor 7 is included in the circuit of the field winding 6 and is adapted to be intermittently short-circuited, as will be hereinafter set forth, for controlling the excitation of the generator 4 and, accordingly, for regulating the voltage of the current which is supplied to the motor 1.

magneto or an auxiliary generator 8, comprising an armature 9 and a field winding 10, is connected to the motor 1 in any suitable manner, as by means of a shaft 11, in order to be operated in accordance with the speed of the motor 1. The field windings 3 and 10 of the motor 1 and the auxiliary generator 8 are directly connected to any suitable source of direct current, such asthe supply conductors 12 and 13.

vibratory-contact regulator 14, comprising a main control magnet 15, an auxiliary magnet 16 and two relays 17 and 18,

is provided for maintaining the speed of the motor substantially constant. The main control magnet embodies an energizing winding 19, which is connected, through a resistor 20, across the terminals of the armature 9 of the auxiliary generator 8, in order I to be operated directly in accordance with the motor speed. The energizing coil 19 operates on a core armature 21 which is pivotally connected to a contact arm 22 and is provided with an adjustable dash-pot 23 for regulating its speed of operation. The contact arm 22 is pivotally mounted upon a lever 23 and is provided with a weight 24 for counter-balancing the wei ht of the core armature 21. An arm 25 pro ects upwardly intermediate the ends of the contact arm 22 and is provided with a main contact member 26 which co-operates with a stationary main contact member 27.

. The auxiliary magnet 16 embodies an energizing'winding 28 which is not only connected, through an adjustable resistor 29, across the terminals of the armature 5 of the main generator 4, but is also connected,

through an adjustable resistor 30, across the terminals of the armature 9 of the auxiliary generator 8. The energizing winding .28 op- .erates on a core armature 31 which is pivotally connected to the lever 23 and is provided with an adjustable dash pct 32 for controlling its operation. The lever 23 is pivotally mounted at 33 and is provided with a spring 34 for balancing a portion of its weight.

The relays '17 and 18 respectively embody two windings 35 and 36, and 37 and 38 which are differentially wound and the energization of which is controlled by the main contact members 26 and 27. The windings 35 and 37 are connected, through a resistor 39, across an auxiliary supply circuit comprising conductors 40 and 41 and normally maintain the relays 17 and 18 in an operative'condition. The coils 36 and 38, which oppose the action of the coils 35 and 37, are adapted to be connected across the supply conductors 40 and 41.by the engagement of the main contact members 26 and 27 to effect the release of the relays 17 and 18. The relay 17 is provided with a contact member 42 which serves to short-circuit the resistor 7 when the relay is in a released position, and the relay 18 is provided with a contact member 43 which serves to short circuit a po tion of the resistor 20 when the relay 18 is in a released position.

Assuming the parts of the system to be in the position illustrated in the drawing and the speed of the motor 1 to be reduced below normal value, then the voltage of the auxiliary generator 8 is correspondingly lowered to reduce the excitation of the main control magnet 15. Upon a reduction in theexcitation of the magnet 15, the core armature 21 is lowered to move the contact arm 22 in a manner to effect engagement between the contact members 26 and 27. Thereupon, a circuit is completed from the auxiliary supply circuit, comprising conductors 40 and 41, through the windings 36 and 38 to permit the release of the relays 17 and 18. The contact member 42 of the relay 17 short-circuits the resistor 7 to increase the excitation of the main generator 4 and, accordingly, increase the speed of the motor 1. The contact member 43 of the relay 18 short-circuits a portion of the resistor 20 in order to increase the excitation of the main control magnet 15 and thus eiiect a separation of the main contact members 26 and 27 at a time just previous to the operation of the motor 1 at normal speed. By such means, the overtravel of the various moving parts of the regulator and the socalled hunting action are prevented.

The auxiliary magnet 16, which is operated in accordance with the voltage of the main generator 4, is adapted to effect a separation of the main contact members 26 and 27 at a time just previous to the raising of the motor speed to normal value and thus prevent any over-travel or hunting action by the regulator. In this regard, it should also be noted that the winding 28 of the auxiliary magnet 16 receives a basic excitation from the auxiliary generator 8 and, as the voltage of the auxiliary generator is raised in accordance with the raise in speed of the motor 1, it is evident that such change will operate the auxiliary magnet 16 in a manner to separate the contact members 26 and 27 and prevent a hunting action by the regulator. Thus, it is apparent that any hunting action by the regulator is prevented by varying the value of a resistor included in the energizing circuit of the main control vention, and such modifications are intended to be covered by the appended claims.

I claim as my invention 1. In a regulator system, the combination with a motor, a main generator for supplying current to said motor, and an auxiliary generator operated in accordance with the speed-of said motor, of a main control magnet operated in accordance with the voltage of the auxiliary generator, an auxiliary magnet operated in accordance with the voltage of the main generator and in accordance with the voltage of the auxiliary generator, and means jointly controlled by said magnets for governing the excitation of the main generator to maintain the speed of the motor substantially constant.

2. In a regulator system, the combination with a motor, and a generator for supplying current to said motor, of a main control magnet operated in accordance with the speed of the motor, an auxiliary magnet having a single coil energized in accordance with the voltage of said generator and in accordance with the speed of the motor, and means jointly controlled by said magnets for governing the excitation of the generator to maintain the speed of the motor substantially constant.

3. In a regulator system, the combinationwith a motor, and a generator for supplying current to the motor, of a main control magnet operated in accordance with the speed of the motor, an auxiliary magnet energized in accordance with the voltage of the generator and the speed of the motor, and means jointly controlled by said magnets for maintaining the speed of the motor substantially constant.

4. In a speed-re ulator system for a motor, a main contro ma et, means for operating the main contro magnet in accordance with the motor speed, a pair of main contact members operated by said main magnet, means, controlled by said contact members for varying the voltage of the cur rent supplied to the motor and for varylng the excitation of the main control magnet, and an auxiliary magnet energized in accordance with the motor speed and in accordance with the voltage of the current supplied to the motor for preventing hunting action by the regulator.

.5. In a speed-regulator system, a main generator, a motor connected to the generator, a main control magnet operated in accordance with the speed of the motor, an auxiliary magnet operated in accordance with the voltage of the generator, a pair of contact members operated by said magnets, and means controlled by said contact members for varying the excitation of the generator to maintain the motor speed constantand for varyin v the excitation of the main control magnet o prevent hunting action by the regulator.

6. In a speed-regulator system for a motor, a main control magnet operated in accordance with the motor speed, an auxiliary magnet energized in accordance with the voltage of the current supplied to the motor and in accordance with motor speed, and

means jointly controlled by said magnets for governing the voltage of the current supplied to the motor and for preventing hunting action by the regulator.

7. In a speed-regulator system for a motor, a main control magnet and an auxiliary magnet, a pair of main contact members jointly controlled by said magnets, means controlled by said contact members for varying the excitation of the main control mag-- net to prevent hunting action by the regulator, and means for selectively energizing the auxiliary magnet to prevent hunting action by the regulator.

8. In a regulator system, the combination with a motor, a main generator connected to the-motor and an auxiliary generator operated in accordance withjthe motor speed, of a regulator comprising a main magnet and an auxiliary magnet for controlling the excitation of the main generator to maintam the speed of the motor substantially constant, means for operating the main magnet in accordance with the auxiliary generator'voltage and means for varying the excitation of the main and the auxiliary magnets to prevent hunting action by the regulator.

9. In a speed-regulator system, a gen erator, a motor connected to the generator, a regulator. comprising a main magnet and an auxillary magnet for maintaining the speed of the motor substantially constant, means 'foroperating-the main magnet in accordance with the motor speed and for operating the auxiliary magnet in accordance with the generator voltage, and means for controlling each of said magnets to prevent hunting action by the regulator.

10. In a regulator system for maintainmg the speed of a motor substantially constant, a regulator comprising a main magnet and an auxiliary magnet, means for operatmg the main magnet in accordance with the motor speed and for operating the auxiliary magnet in accordance with the voltage of the current supplied to the motor, and means for influencing each of said magnets to prevent hunting action.

11. In a speed-regulator system, the combination with a generator, and a motor connected to, and operated by, the generator, of a regulator for governing the excitation of the generator to maintain the speed of the motor substantially constant, said regulator comprising a main control magnet operated 1n accordance with the motor speed, an auxiliary magnet operated in accordance with the generator voltage for preventing hunting action by the regulator, and means for varying the excitation of the main control magnet to prevent hunting actionby the regulator. 4

12. In a regulator system, the combination with a dynamo-electric machine and a second dynamo-electric machine connected to the first machine, of a regulator for governing the excitation of said second machine, said regulator having a magnetic coil connected to said second machine, and an auxiliary source of current connected to said coil.

13. In a regulator system, the combination with a dynamo-electric machine, of a regulator for governing the excitation of said machine, said regulator having a magnetic coil connected across the armature of the machine, and an auxiliary source of energy connected to said coil.

14. In a regulator system, the combination with a dynamo-electric machine, of a regulator for governing the excitation of said machine, comprislng a magnetic 0011, means for. basically exciting said coil, and means for additionally variably excitingi said coil in accordance with the voltage of said machine.

15. In a regulator system, the combina tion with a dynamo-electric machine, of a regulator for governing the excitation of said machine, said regulator having a magnetic coil connected across the armature of themachine, and an auxiliary source of enwhereby hunting action by the regulator is prevented, and means controlled by. said magnets for varying the excitation of one of the magnets to also prevent hunting action by the regulator. r In testimony whereof, I have hereunto subscribed my name this 28th day of Feb. 1919.

, CLARENCE A. BODDIE. 

